EP3315224B1 - Presse zum umformen eines blechrohlings sowie wartungsverfahren einer solchen presse - Google Patents

Presse zum umformen eines blechrohlings sowie wartungsverfahren einer solchen presse Download PDF

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Publication number
EP3315224B1
EP3315224B1 EP17192626.4A EP17192626A EP3315224B1 EP 3315224 B1 EP3315224 B1 EP 3315224B1 EP 17192626 A EP17192626 A EP 17192626A EP 3315224 B1 EP3315224 B1 EP 3315224B1
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EP
European Patent Office
Prior art keywords
holding
down means
press
matrix
blank holder
Prior art date
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Active
Application number
EP17192626.4A
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English (en)
French (fr)
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EP3315224A1 (de
Inventor
Jean Richard SPERA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PSA Automobiles SA
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PSA Automobiles SA
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Publication date
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Publication of EP3315224A1 publication Critical patent/EP3315224A1/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D25/00—Working sheet metal of limited length by stretching, e.g. for straightening
    • B21D25/02—Working sheet metal of limited length by stretching, e.g. for straightening by pulling over a die
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/22—Deep-drawing with devices for holding the edge of the blanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/04—Blank holders; Mounting means therefor

Definitions

  • the present invention relates to a press intended to shape, by a stamping process, a sheet blank.
  • the invention also relates to a method of maintaining such a press.
  • the invention relates to a press which comprises a die and a punch adapted to stamp a sheet blank when the die descends against the punch.
  • the press includes a blank holder which is guided vertically in translation from a first high position to a second low position when the die is lowered against the punch.
  • the blank holder has at least two parts movable between them, such that the first part has a lateral displacement relative to the second part.
  • the blank holder also includes first biasing means interposed between said first part and said second part of the blank holder.
  • Such a method is for example particularly advantageous for the shaping of a sheet blank to form a roof of a motor vehicle, in particular a roof of a large motor vehicle such as a utility vehicle.
  • return means such as pneumatic or hydraulic springs, which by compressing during the stamping operation, gradually stretch the sheet blank.
  • This type of press generally presents problems for maintenance, because when disassembling part of the blank clamps, these return means must first be immobilized. Excluding such a step lengthens the maintenance operation and represents a danger in the event of improper release of these return means.
  • these return means are essential for the operation of a “Stretch Draw” type press.
  • WO 2012/097812 A1 describes a press intended to shape by a stamping process a sheet blank comprising a die, a punch and a blank holder with a connecting rod.
  • the object of the invention is to alleviate this problem and to propose a press intended to shape a sheet metal blank, in particular a sheet metal blank intended to form a roof, by a drawing process of the "Stretch Draw" type.
  • a large motor vehicle such as a utility vehicle.
  • Such a press must allow maintenance operations to be carried out without requiring numerous preparation operations consisting in blocking all the return means, to allow disassembly of the mobile parts such as the blanks and this in a simple and secure manner.
  • the subject of the invention is a press intended to form a sheet blank, by means of a stamping process, comprising a die and a punch suitable for stamping the sheet blank when the die is lowered against the punch, said press comprising a blank holder which is guided vertically in translation from a first high position to a second low position when the die is lowered against the punch.
  • the blank holder has at least two parts movable between them, such that the first part has a lateral displacement relative to the second part.
  • the blank holder also comprises first return means interposed between said first part and said second part of the blank holder, such that the first return means, in the low position of the blank holder, are arranged so as to have a positioning said relaxed.
  • the second part of the blank holder is in lateral support against the first part of the blank holder.
  • the second part of the blank holder is connected to the press frame by means of a connecting rod adapted to distance laterally said second part of the blank holder during the descent of the matrix.
  • the connecting rod has a first end integral with the second part of the blank holder and a second end integral with the frame, the first end and the second end of the connecting rod form respectively with the second part of the blank holder and with the frame pivot type connection means.
  • the matrix comprises a lateral part adapted to collaborate with the first part of the blank holder to block a lateral edge of the sheet blank, said lateral part comprising second return means suitable for s oppose the lateral displacement, towards the outside of the press, of the first part of the blank holder during the descent of the die.
  • the blank holder comprises a third part which includes guide means making it possible to guide said blank holder vertically in translation.
  • the third part of the blank holder forms a support along which the first part and the second part of the blank holder are guided laterally in translation.
  • the third part of the blank holder has a side wall which forms a stop adapted to limit the lateral displacement in the direction of the punch of the first part of the blank holder.
  • the first return means are adapted to keep the first part of the blank holder in abutment against the stop of the third part of the blank holder.
  • the present invention also relates to a method of maintaining a press according to the invention according to claims 1 - 6 such that, the blank holder being previously positioned in the low position, said method comprises a step of dismantling the first part of the blank holder and a step of reassembling said first part without modifying the operation of the first return means.
  • the figures 2 , 3 and 4 represent partial side views, in section, of the press 1 during different stages of the stamping process of the sheet blank 2.
  • the die 5 of the press 1 begins its descent in the direction of the punch 3.
  • the lateral part 51 of the matrix 5 bears against the first part 41 of the blank holder 4.
  • a rod 22 is formed which is adapted to block the lateral edge 21 of the sheet blank 2 between the lateral part 51 of the matrix 5 and the first part 41 of the blank holder 4.
  • the die 5 of the press 1 continues its descent in the direction of the punch 3, bringing with it a first phase of descent of the blank holder 4.
  • the push rods 45 of the greenhouse blank 4 begins to be compressed, creating a restoring force opposing the descent of the matrix 5.
  • the clamping force of the lateral edge 21 of the sheet blank 2 between the lateral part 51 of the matrix 5 and the first part 41 of the blank holder 4 increases accordingly.
  • the connecting rod 6 pivots by a first angle ⁇ 1 sliding the second part 42 of the blank holder 4, which forms a piston, against the first bearing surface 411 of the first part 41 of the greenhouse -flan 4.
  • the first return means 44 are in a so-called relaxed positioning, causing the free end of the control rod 443 of the piston 441 of the first return means 44 to no longer exert a return force against the second bearing surface 412 of the first part 41 of the blank holder 4.
  • the die 5 of the press 1 is in contact with the punch 3, allowing the press 1 to shape the sheet blank 2.
  • the whole lateral part 51 of the die 5 and blank holder 4 have deviated by a distance d 1 from the central part 54 of the die 5 and the punch 3.
  • This spacing d 1 makes it possible to tension the sheet blank 2 during the stamping phase.
  • This spacing d 1 results from the pivoting of the connecting rod 6 by a second angle ⁇ 2 , causing the second part 42 of the blank holder 4 to slide more against the first bearing surface 411 of the first part 41 of the blank holder 4.
  • the first return means 44 remain in a relaxed position. In this last position of the press 1, the blank holder 4 is in its low position as defined above.
  • FIGS. 5 , 6 and 7 show partial side views in section of the press during different stages of maintenance of the press according to the invention.
  • the entire upper part of the press is removed, making it possible to carry out maintenance operations on the press 1.
  • the blank holder 4 is previously positioned in the low position and the push rods 45 are partially disassembled.
  • the withdrawal of the first part 41 of the blank holder 4 is done without modifying the operation of the first return means 44, thereby simplifying the disassembly and reassembly of the first part 41 of the blank holder 4.
  • the upper part of the press ie the die 5
  • the push rods 45 have not yet been reassembled and the whole press is not not yet returned to its work location.
  • the second return means 53 of the matrix 5 position the lateral part 51 in lateral abutment against the central part 54 of the matrix 5.
  • the blank holder 4 is in the low position, causing the first part 41 of the blank holder 4 is spaced from the spacing d 1 of the third part 43 of the blank holder 4. This results in a problem of alignment of the lateral part 51 of the matrix 5 with the blank holder 4.
  • the oblique bearing surface 522 of the second key 52 of the lateral part 51 of the matrix 5 comes to bear against the oblique bearing surface 415 of the first key 46 of the blank holder 4.
  • the sliding of these oblique bearing surfaces 415 and 522 one against the other aligns the lateral part 51 of the matrix 5 opposite the first part 41 of the blank holder 4 , by opposing the second return means 53 of the matrix 5.
  • the lateral part 51 of the die 5 is correctly aligned with the first part 41 of the blank holder 4.
  • the spacing d 1 is found well between the lateral part 51 and the central part 54 of the matrix 5.
  • the press 1 can now be repositioned along the production line.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Claims (7)

  1. Presse (1), die dazu bestimmt ist, durch ein Tiefziehverfahren eine Blechscheibe (2) zu formen, die eine Matrix (5) und einen Stempel (3) umfasst, die angepasst sind, um die Blechplatte (2) bei dem Senken der Matrix (5) gegen den Stempel (3) tiefzuziehen, wobei die Presse einen Niederhalter (4) umfasst, der vertikal in Verschiebung von einer ersten Hochstellung zu einer zweiten Tiefstellung bei dem Senken der Matrix (5) gegen den Stempel (3) geführt ist, wobei der Niederhalter (4) mindestens zwei Teile (41, 42), die zueinander beweglich sind, umfasst, so dass der erste Teil (41) eine seitliche Verlagerung in Bezug auf den zweiten Teil (42) aufweist, wobei der Niederhalter (4) auch erste Rückstellmittel (44) umfasst wobei in der Presse die ersten Rückstellmittel (44) in der Tiefstellung des Niederhalters (4) derart eingerichtet sind, dass sie eine sogenannte entspannte Positionierung aufweisen, und in der Tiefstellung des Niederhalters (4) der zweite Teil (42) des Niederhalters (4) in seitlicher Auflage gegen den ersten Teil (41) des Niederhalters (4) ist, wobei der zweite Teil (42) des Niederhalters (4) mit dem Gerüst (7) der Presse (1) über ein Pleuel (6) verbunden ist, das angepasst ist, um den zweiten Teil (42) des Niederhalters (4) bei dem Senken der Matrix (5) seitlich zu entfernen, wobei das Pleuel (6) ein erstes Ende (61), das fest mit dem zweiten Teil (42) des Niederhalters (4) verbunden ist, umfasst, und ein zweites Ende (62), das fest mit dem Gerüst (7) verbunden ist, wobei das erste Ende (61) und das zweite Ende (62) des Pleuels (7) jeweils mit dem zweiten Teil (42) des Niederhalters (4) und mit dem Gerüst (7) Verbindungsmittel vom Typ Zapfen bildet, dadurch gekennzeichnet, dass die ersten Rückstellmittel (44) zwischen den ersten Teil (41) und den zweiten Teil (42) des Niederhalters (4) eingefügt sind.
  2. Presse (1) nach Anspruch 1, dadurch gekennzeichnet, dass die Matrix (5) einen Seitenteil (51) umfasst, der angepasst ist, um mit dem ersten Teil (41) des Niederhalters (4) zusammenzuwirken, um einen Seitenrand (21) der Blechplatte (2) zu blockieren, wobei der Seitenteil (51) zweite Rückstellmittel (53) umfasst, die angepasst sind, um sich der seitlichen Verlagerung nach außerhalb der Presse (1) des ersten Teils (41) des Niederhalters (4) bei dem Senken der Matrix (5) zu widersetzen.
  3. Presse (1) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Niederhalter (4) einen dritten Teil (43) umfasst, der Führungsmittel (45) umfasst, die es erlauben, den Niederhalter (4) in Verschiebung vertikal zu führen.
  4. Presse (1) nach Anspruch 5, dadurch gekennzeichnet, dass der dritte Teil (43) des Niederhalters (4) einen Träger bildet, entlang dem seitlich in Verschiebung der erste Teil (41) und der zweite Teil (42) des Niederhalters (4) geführt sind.
  5. Presse (1) nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass der dritte Teil (43) des Niederhalters (4) eine Seitenwand (431) umfasst, die einen Anschlag bildet, der angepasst ist, um die seitliche Verlagerung in Richtung des Stempels (3) des ersten Teils (41) des Niederhalters (4) einzuschränken.
  6. Presse (1) nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass die ersten Rückstellmittel (44) in Hochstellung des Niederhalters (4) angepasst sind, um den ersten Teil (41) des Niederhalters (4) gegen den Anschlag (431) des dritten Teils (43) des Niederhalters (4) zu halten.
  7. Verfahren zur Wartung einer Presse (1) nach einem der vorstehenden Ansprüche, wobei:
    - der zweite Teil (42) des Niederhalters (4) in Seitenauflage gegen den ersten Teil (41) des Niederhalters (4) ist, wobei der zweite Teil (42) des Niederhalters (4) mit dem Gerüst (7) der Presse (1) über ein Pleuel (6) verbunden ist, das angepasst ist, um den zweiten Teil (42) des Niederhalters (4) bei dem Senken der Matrix (5) seitlich zu entfernen, wobei das Pleuel (6) ein erstes Ende (61) umfasst, das mit dem zweiten Teil (42) des Niederhalters (4) fest verbunden ist, und ein zweites Ende (62), das mit dem Gerüst (7) fest verbunden ist, wobei das erste Ende (61) und das zweite Ende (62) des Pleuels (7) jeweils mit dem zweiten Teil (42) des Niederhalters (4) und mit dem Gerüst (7) Verbindungsmittel vom Typ Zapfen bilden;
    - der Niederhalter (4) zuvor in Tiefstellung positioniert wird, wobei das Verfahren einen Demontageschritt des ersten Teils (41) des Niederhalters (4) und einen Rückmontageschritt des ersten Teils (41) ohne Ändern des Funktionierens der ersten Rückstellmittel (44) umfasst, dadurch gekennzeichnet, dass die ersten Rückstellmittel (44) zwischen den ersten Teil (41) und den zweiten Teil (42) des Niederhalters (4) eingefügt sind.
EP17192626.4A 2016-10-26 2017-09-22 Presse zum umformen eines blechrohlings sowie wartungsverfahren einer solchen presse Active EP3315224B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1660369A FR3057791B1 (fr) 2016-10-26 2016-10-26 Presse destinee a mettre en forme un flan de tole et procede de maintenance d’une telle presse

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EP3315224A1 EP3315224A1 (de) 2018-05-02
EP3315224B1 true EP3315224B1 (de) 2020-04-08

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EP17192626.4A Active EP3315224B1 (de) 2016-10-26 2017-09-22 Presse zum umformen eines blechrohlings sowie wartungsverfahren einer solchen presse

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EP (1) EP3315224B1 (de)
ES (1) ES2784708T3 (de)
FR (1) FR3057791B1 (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012097812A1 (de) * 2011-01-21 2012-07-26 Giw Verwaltungs- Und Vertriebs Gmbh Verfahren und vorrichtung zum ziehen von blechen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3459025A (en) 1967-12-07 1969-08-05 Cyril Bath Co Stretching fixture with quadrilateral linkage control of stretch head movements
ATE221423T1 (de) * 1997-09-18 2002-08-15 Cosma Int Inc Streck- und ziehwerkzeug und zugehöriges verfahren
DE10334483B4 (de) * 2003-07-29 2006-09-28 Daimlerchrysler Ag Verfahren und Ziehwerkzeug zum Herstellen eines Blechteils aus einer Platine
JP5319748B2 (ja) * 2011-09-09 2013-10-16 エムズ株式会社 プレス成形方法及びプレス成形装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012097812A1 (de) * 2011-01-21 2012-07-26 Giw Verwaltungs- Und Vertriebs Gmbh Verfahren und vorrichtung zum ziehen von blechen

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ES2784708T3 (es) 2020-09-30
FR3057791A1 (fr) 2018-04-27
EP3315224A1 (de) 2018-05-02
FR3057791B1 (fr) 2018-11-23

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